Tomatoville® Gardening Forums - View Single Post - Black spots on tomato stems

mcsee · May 23, 2020

I've looked at Cornell University site for Tomato Diseases and it is most likely Alternaria Stem Canker, which pretty much is the death knell of the plant.

If it were Late Mold/Mould, the black lesions should have a noticeable white margin around them, which the photos don't show.

May 23, 2020	#3
mcsee Tomatovillian™ Join Date: Aug 2007 Location: Victoria. Australia Posts: 543	I've looked at Cornell University site for Tomato Diseases and it is most likely Alternaria Stem Canker, which pretty much is the death knell of the plant. If it were Late Mold/Mould, the black lesions should have a noticeable white margin around them, which the photos don't show. Last edited by mcsee; May 24, 2020 at 10:14 PM. Reason: Additional Reference added.